chemical gradient is
defined as the a gradient appearance by the dissimilarity in concentration of a
certain type of solute in an universal solvent take examples like salt in water.
electrical gradient is defined as the disparity between the electrical potential of
a given solute in an universal solvent. fundamentally, if the chemical that
establishes the chemical gradient is electrically charged. Then the diversity
in the charge over the barrier will produce an electrical gradient
hope it helps